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A LOW-SENSING PROTECTION CIRCUIT FOR BATTERY-POWERED DEVICES

IP.com Disclosure Number: IPCOM000005424D
Original Publication Date: 1980-Aug-01
Included in the Prior Art Database: 2001-Oct-10

Publishing Venue

Motorola

Related People

Authors:
Richard Barnett

Abstract

This circuit senses load current and thereby provides for three modes of operation: "stand- by/receive", " transmit" and "overload". In "overload", false tripping by transients is prevented by a se- quenced delay which causes the load to remain disconnected until the overload condition is corrected, with automatic reset at that time. During the "standby/receive" mode of operation, very low current drain is present, and a single load current path is available. In "transmit" mode, the load current is increased and an additional current path is also used. If an overload condition occurs, the current in both paths is interrupted for a short time, then the first path is again available for a very brief period. If the overload condition still exists, the delay sequence repeats until a safe level of current is reached, then the circuit again operates normally.